Safety panel-box.



H. F. KRANTZ.

SAFETY PANEL BOX.

APPLICATION FILED IIIAILBI, |911.

Patented Jan.28,1919.

2 SHEETS-SHEET l.

5 Vwo I/I/foz H. F. KRANTZ.

SAFETY PANEL BOX.

APPLICATION FILED IIIAII.3I, 1911.

2 SHEETS-SHEET 2.

@nvm/Mofa Patented Jan. 28, 1919.

.JM l @Hom/m13 UNITED sTATEs PATENT oEEicE I HUBERT IE'. KRANTZ, 0F BROOKLYN, NEW YORK, ASSIGNOR TO KRANTZ MANUFAC- TURIN G COMPANY, INC., OF BROOKLYN, NEW YORK, A CORPORATION OF NEW YORK.

SAFETY PANEL-BOX.

Specification of Letters Patent. 'Patentgd Jan, 28, 19] 9 Application :filedMarch 31, 1917. Serial No. 158,95*.7.

To all whom t may concern:

Be it known that I, HUBERT F. KRANTZ, residing at Brooklyn, in the county of Kings and State of New York, have invented certain new and usefullmprovements in SafetyV Panel-Boxes, of which the following is a specification. I

This invention relates to a safety panel box and comprises certain modifications and improvements over the-structure shown in 'my co-pending application Serial Number The particular object of the present in- `means associated with the swinging door in such m..nner as to not only prevent the opening of the door when the switch is in the on position but also to positively prevent movement of the switch from the o position into the on position while the door is open.

-A further detailedobject is to provide' means .adapted to prevent movement oi' the switch from the orf to on position while the door is open, and to include in said means an element adapted particularly to compensate for inaccuracies in manufacture whereby to decrease the amount of care and exactness, 'and therefore to decrease the expense,`incident tothe manufacture of the device.

A further object is to provide, in corn-bh nation with a door and switch controlled latch-mechanism therefor, an auxiliary latch mechanism also associated withJ the switch Y while the switch is in the on position.

'A further' object is to provide a safetyY panel box having a bodily removable cover Y dle may be locked and to provide that substantially all of theA moving parts of the switch mechanism are carried by and removable with said cover for purposes of inspection, repairs, etc.

Other objects and aims of the invention, more or less specific than those referred to above, will be in part obvious and in part pointed out inthe course of the following description of the elements, combinations, arrangements of parts and applications of principles, constituting the invention; and the. scope of protection contemplated will be indicated in the appended claims.

In the accompanying drawings which are` to be taken as a part of this specification, and in which-l have shown merely a preerred form of embodiment of the invention:

Figure l is a longitudinal vertical sectional view through a panel box constructed in `accordance with this invention, parts being illustrated in elevation, the switch being shown in the off position.

`1g. 2 is a diagrammatic view illustrating certain of the movable elements of F ig. 1 in the position assumed when theswitch is on, and l Fig. 3 isa top plan view of the structure shown in F ig. l, parts being broken away for better disclosing the structural arrangement of the parts.

Referring to the. drawings for describingV in detail the structure which is illustrated therein, the reference character L indicates the panel box generally. This may be made up of any suitable material, either sheet -metal or otherwise, according to preference.

in the drawing it is shown as being made fromsheet metal. The switch mechanism Gr is arranged within the box, being preferl ably'xed to the upper wall l of the box and having a handle 2 projecting through an opening 3 formed through 'said upper wall. lf desired, a ange-like part 4 may be formed upon the wall l adjacent the' handle to provide an opening 5 for the insertion of locking means by which the hanin either its on or oil' position. Y I

The switch mechanism per se is substantially the same as thatillustrated in the men- .tioned co-pending application and comprises a swinging double'ended contact member 6 v adapted to be swung by the handle 2 for upon a"- suitable base 9 of insulating material. A toggle is interposed between the handle and the con-tact member 6 adapted to hold the contact member on when the togigle is made, and to permit the contact member to move olf under the impulse of a` suitable spring whenthe -toggle is broken.

A plunger 10 is formed as a part of the switch mechanism. The particular manner of connecting this plunger with the switch mechanism forms no part of the present invention. It is suiiicient to say that when the handle 2 is thrown from an olf to an on position the plunger is projected outwardly (compare Figs. 1 and 2). Also that it is impossible 4to throw the handle from the off to the on position whenever means is interposed to prevent outward movement of the plunger. One manner of connecting this plunger in the switch mechanism is clearly illustrated Ain my co-pending application Serial Number 42,956. Here the plunger is connected with the knee of the toggle so as to be moved Iback and forth as' the toggle is broken andf made and so as to break the toggle whenever the plunger is forced back.

Vithin the box is mounted also a fuse as H. .This is carried between suitable clips 11 and 12 Vand is so disposed that when the handle 2 is thrown to the on position the electric current will pass from the contact 7 through the member 6 to the contact 8 and thence through the fuse. When the handle 2 is in the off position the current is dead ended at the contact 7 and thereis no charge whatever either in the contact member 6, or in the member 8, or in the fuse. Hence when the handle 2 is inthe off position an operator may insert or remove the fuse at will without any danger of receiving a shock.

' VV'hen the handle 2 is in the on position,

however, itwould be dangerous for an operator to insert hisr hand, or a tool, into proxv imity with the fuse for any purpose.

For this reason the door, as 13, which is provided as a `part of the upper wall 1 of the box just above the fuse position forv giving A access to the fuse, is furnished with a suitable safety means for preventing any possibility of its being opened while the handle is in the on position, and for preventing the handle from being moved from the off to the on position while the door is open.

v pivot or hinge 15 ofy the door.

This safety means in thepresent instance comprises first, a semi-circular retaining disk 1st-,connected to the door concentric with the doo-r is swung open the peripheral portion of the disk is moved into the path of the plunger 10 so that it becomes impossible to ,an opened position at the proper time.

W'hen the latch 16 rotatably carried by the door Aadjacent the free edge thereof. A handle 17 projects through the door by means of which the latch 'may be turned from a locked to A link 18 is also connected t-o the latch and extends along the under. surface of the door backwardly beneaththe retaining disk 14 to a point infproximity with the end of the plunger 10. The rear end of the link is provided with a shoulder 19 disposed `to stand in the path of the plunger. The link is slidably supported upon the door and its forward end is pivotally connected to the' latch 16. The pointl of engagement with the latch is .slightly off center, as shown in Fig. 3.

Then the handle 2 is in the off position and the plunger 10 withdrawn the latch may -be rotated at will, but whenl the handle 2 is in the on position and the plunger projected, ythe link 18 is moved forward so as to rotate the latch into alocked position, as shown in Fig. 2. In this position the forward edge of the latch stands beneath a fixed shoulder 20 formed upon the adjacent edge of the upper wall 1 of the box. The latch cannot be moved from beneath the shoulder 20 unless the plunger 10 be first withdrawn. Y v

Hence the door is closed and positively locked whenever the handle is in the on position. y

i In the manufacture of devices of this general type certain inaccuracies in the disposition of the individual parts inevitably occur unless the most exacting care and inspection is exercised. This means added expense and, as indicated above, it is an object of this invention to provide means for minimizing the care necessary to be exercised in this connection. i

With this object in mind, it will be noted that the latch 16 comprises a depending lug -21 which will strike against Ithe edge surface 22 of the shoulder 2O when the door is in a nearly, but not completely, closed position yand it is attempted to actuate the handle 2.

condition for two reasons, first, vbecause the door would remain slightly open so that a tool or wire might beaccidentally slid between the crack into contact with one of the live parts, and second, since the plunger is moved outwardly beneath the corner 23 of the retaining disk and the door is unlocked, a strong pull by an ignorant hand would derange either the switch mechanism or some part of the door unless the parts be made suiciently strong to withstand this strain as mentioned hereinafter.

rlhe provision of the lug 21, however, renders it impossible for the latch 16 to rotate at any time while the corner 23 is in its approximately closed position, so that the inaccuracies which inevitably occur during manufacture as above referred to will not detrimentally effect the uniformly eiiicient operation of the device.

The disk la may, if desired, be provided with lany suitable device, as for instance the notch 32, to be engaged by appropriate means for retaining the door in one of its positions.

It has been found in practicethatit is desirable to provide means, even in addition to the safety means above described, for preventing the partial dismantlement of the box structure. As illustrated, this invention includes such a means and itis shown to be arranged for preventing the possibility of an unauthorized person removing the upper wall of the box while the switch is in the on position. lThis element of the invention may comprise any suitable mechanism and may be arranged and connected in any desired manner, but preferably it includes a bolt 24 slidably mounted in brackets 25 fixed to the under side of the upper wall of the box. The nose 26 ofy the bolt normally stands in a position to be thrust beneath a fixed shoulder 27 carried by one of the side walls of the box. A spring 28 is disposed for urging the bolt into its normal position. rlhe opposite end of the bolt is provided with a cross head 29 disposed in a position to be engaged by the latch 16 when the latch is rotated to locked position, the rotation of the latch being adapted to slide the bolt against the tension of the spring .for projecting the nose 26 beneath the shoulder 27 Hencewhenever the switch is in the on position and therdoor is closed, as it must be held in a position to lock the top wall to the side wall of the box.

The top wall may be normally held in po sition by any suitable means as for instance the screws 30, In this connection it is important to note that substantially all of the movable parts of the device are supported and carried by the top wall and are, therefore, bodily removable as an entirety with said top wall for purposes of inspection and repairs, etc. lVith the top wall detached and removed all of the movingvparts carried thereby may be readily operated, the same as when in place upon the box.v The door section may be swung back and forth. The latch parts may be operated, and the coperative relation of the latch parts with the switch movement may be inspected and repairs made if necessary, after which the whole may be returned into connection with the box.

Vhile the slide bolt 24, or other equivalent means connected to be operated by the movement of the link 18 may be sufficient in most cases for retaining the top wall against displacement, nevertheless it will be apparent that the engagement of the switch blade beneath the contact 7 also constitutes a means to prevent removal of the top wall.

When the top wall is in position, and the switch is om the engagement of the switch blade with the contact 7 serves as an auxiliary to the slide bolt to constitute a more positive y and efficient means for retaining the top wall against displacement. These coperative parts are further assisted and rendered more eiicient by the presence of the depending flange 31 which is formed upon the top wall and which over-laps the adjacent side and end walls of the box in such manner as to prevent any such shifting of the top wall as might enable the slide bolt means or the switch blade to release their hold. The surrounding flange 31 also effectually closes any crack which might occur between the cover and the side and end walls owing to looseness of engagement of the slide bolt with the part 27.

The switch must necessarily be moved 0E before any access whatever can be gained into the box, either through the door opening or by removal of the top wall.

lt should be pointed out, as indicated by the dotted line 31a in Fig. 1, that the outer, or butt, endof the handle 2 may serve as a stop for limiting the opening movement of the door if desired. rlhe fact that the handle is necessarily 'in the od position as in F ig. 1 when the door is open and is positively held in such position, by the disk 14, makes said handle to constitute a positive and satisfactory 'stop against which the door may rest when thrown open. As above. suggested, if the parts 10, 14, 15, 23, etc., be made of appropriate strength, then engagement of the corner 23 with the upper surface of the part 10 may serve to oppose opening movement of the door. lndeed, this function may become particularly valuable under certain. circumstances, for instance in the event of failure of the latch 16 properly to perform its appointed function.

As many changes could be made in this construction without departing from the scope of the following claims, it is intended that all matter contained in the above description or shown in the accompanying drawing shall be interpreted as illustrative only and not in a limiting sense.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

l. A device of the class described, comprising a switch mechanism having a part movablevinto on and off position, a safety device associated therewith movable into vand out of safety position and said safety device and said switch mechanism having parts coperative first, to prevent movement of the safety device into nonsafety position when the switch mechanism is in the on position, and second, to prevent movement of the switch mechanism into the on position when the safety device is in non-safety position, and an auxiliary safety device for the switch mechanism arranged to be operated by the first `safety dev1ce.

2. A device of the class described, comprising a switch mechanism movable into on and off positions, a safety device associated therewith movable into and out of safety position, and an auxiliary safety device for the switch mechanism arranged to be operated by the first safety device.

3. A device of the class described, comprising a panel box having a removable wall, a switch mechanism within the panel box, a safety device associated with the switch mechanism movable into and out of' safety position, and means operatively associated with said safety device for locking the mentioned wall against removal when the switch is in the on position.

4. A panel box having a movable door and having a movable wall part, a switch mechanism within the panel box, means operatively associated with the door and with the switch mechanism to prevent movement of the switch mechanism to the on position except when the door .is closed, and means controlled by the switch mechanism to retain the movable wall part in position against movement while the switch is in the on position.

5. A panel box having a removable wall part, a movable door forming one part of said wall, a switch mechanism within the box, means for preventing movementof the` switch mechanism into the on position except when the door is closed, and means also for preventing removal of said wall while the switch mechanism is in the on position.

6. A panel box having a removable wall part, a movable door forming one part of said wall, a switch mechanism within the box, means for preventing movement of the said wall when the switch is in the on position.

7. A device of the class described, comprising a switch mechanism having a part movableinto on and off positions, a safety device associated therewith movable into and out of safety position, said safety device and said switch mechanism having cooperative parts arranged first, to prevent movement of the switch mechanism into the on position when the safety device is.in non-safety position, second, to permit movement of the switch mechanism to the on position when'the safety device is in safety position, and said safety device comprising an independent elementfor preventing movementl of the switch mechanism into the on position when the safety device is in nearly safety position.

8. A panel box having a pivotally mounted door inv one wall thereof, switch mechanism within the panel box adjacent the door having parts movable into on and off positions, latch mechanism carried by the door having a part disposed in proximity to a moving part of the vswitch mechanism for moving 'the latch mechanism into locked position when the switch mecha-I nism is moved into the on position, all in combination with retaining means carried by and movable with the door having a part substantially concentric with the axis of the door hinge, disposed to be moved into the path of movement of the movable part of the switch mechanism for preventing movement thereof from the off to the on position when the dooris open.

9. A safety panel box having a door movable into open and closed positions, a switch device, means operable while the door is open a given distance to prevent movement is open a less distance, and said last mentioned means being connected with said latch in a manner to move the latch to locking position from the switch after the door is entirely closed.

11. A safety panel box having a door movable into open and closed positions, a switch device, a latch to lock the door closed,

means operable while the door is open a given distance to prevent movement of the switch into on position, independent means operablet'o prevent movement of the switch into on position while the door is open a less distance, and said last mentioned means comprising a movable member connected by one end to the latch to impart its movement to the latch and having its other end disposed to receive movement from the switch device after the first mentioned means becomes inoperative, together with means to prevent movement of said member and latch by the switch device except when the door is entirely closed.

l2. In a safety panel box having a door movable into open and closed position, a latch device to lock the door closed, and an operable device which it is desired shall not be operated except when the door is closed and locked, the combination therewith of means for preventing operation of said operable device while the door is open, means controllable from vsaid operable device when the door is vclosed for moving the latch device into locking position co-incident with an operation of said operable device, and

said latch device being manually operable and being of a character to hold the .door

latched until manually released following an operation of said operable device. .V

13. A safety panel box having a door movable into open and closed positions, a latch to lock the door closed, a switch device, means operable while the door is open a given distance to prevent movement of the switch into on position, independent means operable to prevent movement ofthe switch into on position while the door is open a less distance, and said last mentioned means comprising a movable member connected by one end to the latch to impart its movement to the latch and having its other end disposed to receive movement from the switch device after the first mentioned means becomes inoperative.

14. A safety, panel box having a door movable in open and closed positions, a latch to lock the door closed, a switch device, means operable while the door is open a given distance to prevent movement of the switch into on position, and independent means operable to prevent movement of the switch into on positionwhile the door is open a less distance.

15. A safety panel box having a door opening through its upper wall movable into open and closed positions, a switch mechanism within the box, an operating handle for the switch mechanism having one of its ends projecting outwardly through said upper wall whereby to operate the switch mechanism, and connections between the op'- erating handle and the door of a character to require movement of the handle into position disposing the butt end thereof to constitute a stop behind the door for limiting any opening movement of the door.

16. A safetypanel box having a removable wall, a contact stationary within said box, a switch blade within the box carried by said wall and removable therewith, operating means for the switch blade partly also within the box operable to move the switch blade into and out of engagement with said stationary contact, said operating means being also carried by and removable with said wall, and said wall comprising in part a door for giving access into the box when said wall is attached, said doorsbeing bodily removable with said wall.

17. A safety panel box having a removable vwall, a contact stationary within said box,

a switch blade within` the box carried by said wall and removable therewith, operating means for the switch blade partly also within the box operable to move the switch blade into and out of engagement with said stationary contact, said operating means being also carried by'and removable with said wall, said wall comprising in part a door for giving access into the box when said wall is attached, means carried by the door movable with relation to said operating means to prevent operation of said operating means when the door is in one position, and said door being bodily removable with said wall.

18. A device of the class described comprising a wall member made up of a main section and a hinged section, a switch movement fixed to the main section including a movable switch blade and operating mechanism therefor at one surface of said main section and an actuating handle-projecting through said main section to the other surface thereof, means carried by the hinged section hav-` A ing a part to coperate with said operating mechanism forpreventing operation thereof when'said hinged section is in a giyen'position of swing, and means to which said wall part is detachably connected to complete a 0x, said means having a contact carried thereby for coperating with the switch blade within the box.,

1 9. A device of the class described comprising a box having a removable wall, a

switch mechanism within the box, a safety l guard device associated with the switch mechanism movable into and out of position blocking access to the switch mechanism and said guard device comprising means for effecting retention of said removable wall when the switch is on the on? position.

20. A device of the class described comprising a box having a removable wall, a'

switch mechanism within the box, a safety guard device associated with the switch mechanism movable into and out of position blocking access `to the switch mechanism,

said guard device comprising means cooperative with the switch mechanism requiring that said guard device be in guarding position when the switch is on, and said means being cooperative with the switch mechanism also for eli'ecting retention of said removable wall when the switch is in the on position. p

2l. .A panel box having a movable door and 10 having a removable wall part, a switch mechanism within the box, and means which is cooperative between the ldoor and the switch mechanism when the door is closed to eect retention of said removable wall part whenever the switch is operated into the on position.

22. A device of the class described comprising a box having a removable wall, `a switch mechanism within the box, a contact also within the box, the switch mechanism including a switch blade movable into and out of engagement with said contact, said switch blade and contact being of a disposition such that one is interposed directly in the path of the other in a: manner to prevent removal of said removable wall while the switch is on, and other means operable vby the switch mechanism also toprevent removal of Isaid removable wall while the switch is on,

mechanism within the boxl comprising a switch blade movable into on and olf positions, a contact within the box with which said switch/blade cooperates, means cooperative between said door and said switch mechanism to prevent opening of the door when `the switch blade is on, said means being of a character also to effect retention of the removable wall part when the switchis on, and said switch blade and contact also constituting auxiliary means for preventing removal of said removable wall part when the switch is on.

25., A panel box having a removablewall, a switch mechanism within the4 box carried by said removable wall so as to be removable therewith and including a switch blade movable through a given path into on and Aoii' positions,'a contact fixed within the box with which said switch blade cooperates,

and said contact being interposed in said 65 path of movement of the switch blade so Adevice of .the class described comv prismg a box having a removable wall, al

that engagement of the switch blade against the contact will oppose removal of said re.` movable wall when the switch is on.

26. A panel box having a removable wall part, a switch mechanism within the box carried by said removable wall so as to be removable therewith and including a switch blade having a part movable toward and away from said removable wall, and a contact fixed within the box with which said part of the switch blade cooperates, said contact being interposed in the path of movement of said part of the switch blade between said part of thev switch blade and said removable wall to thereby constitute means toA prevent removal of said removable wall when the switch is on.

27. A panel box having a removable wall, a door comprised in said wall for giving access into the box, a switch mechanism arranged within the box, and means carried by said door and extending into coperation with! said switch mechanism Jfor eifecting retention of said removable wall when the switch is in the on position.

28. A panel box having' a removable wall, a door comprised in said wall for giving access into the box, a switch mechanism arrangedwithin the-box, a contact within the box with which said switch mechanism cooperates, means carried by the door extending into coperation with said switch mechanism for effecting retention of said removable wall when the switch is in the on position, and said switch mechanism and contact constituting auxiliary means also to prevent removal of the removable Wall when the switch mechanism is on.

29. A panel box having a removable wall,

a door comprised in said wall for giving access into the box, a switch mechanism arranged within the box, carried by and removable with said wall, a contact within the box with which said switch mechanism cooperates, means carried by the door extending into coperation with said switch mechanism for effecting retention of said removable wall when the switch is in the on7 position, said switch mechanism including a switch blade, and said contact being interposed as an obstruction to be engaged by the switch blade also to prevent removal of said y removable wall when the switch is on.

30. A panel box having a removable Wall, a switch mechanism arranged within the box including a switch blade movable into on and off positions, a conta-ct within the box with which said switch blade cooperates, retaining means associated with said switch mechanism operable to interengage between said removable wall and the remainder of the box to prevent rremoval of the removable wall when the switch mechanism is on, and said switch blade and contact constituting auxiliary retaining means also to overhanging ledge, retaining means carried by said removable wall and operatively connected with the switch mechanism to be projected beneath said overhanging ledge whenever the switch mechanism is operated into on position to thereby prevent removal of the removable wall, and a marginal flange formed upon the lremovable wall overlapping the adjacent portions of the box to prevent shifting of the removable wall and to thereby render said retaining means effective.

32. A device of the class described, comprising a box having a removable wall, a switch mechanism within the box, a contact element also within the)b box, the switch mechanism including a switch blade element arranged to coperate with said contact element, connections between said elements and the box and removable `wall respectively, means to move one of said mentioned elements through a given path into direct elecvent detachment of the detachable wall while the switch mechanism is on, and means interengaging the detachable wall and the remainder of the box to prevent shifting of the detachable wall and thereby to render both said retaining means effective.

34.. A device of the class described, comprising a double-ended switch blade pivotally supported intermediate its ends, a casing for inclosing and protecting said switch blade, operating means for the switch blade by which to swing the switch blade about its pivot into on and off positions, the casing having a removable wall and said switch blade and said operating means being carried b and removable with said wall, a

4pair o contacts stationary within the casing with which the switch blade coperates to close a circuit through said contacts when the switch blade is on, the two ends/of the switch blade engaging the contacts by movement in opposite directions, all of said parts being disposed so that the switch blade will be moved into and out of functioning relation with said contacts by the attachment and removal of the removable wall, and one end of the switch blade serving to retain the removable wall against removal when said end is in engagement with its respective contact.

35. A panel box having a pivotally mounted door in one wall thereof, switch mecha- .nism within the panel box adjacent the door having parts movable into on and off positions, latch mechanism carried by the door having a part disposed in proximity to a moving part of the switch mechanism for moving the latch mechanism into locked position when the switch mechanism is moved into the on position, all in combination with means carried by the' door adapted when the switch mechanism is on to engage said mentioned moving part of the lswitch mechanism to oppose opening movement of the door in the event of failure of said mentioned latch mechanism.

36. A safety panel box having a door movable into open and closed positions, a switch device, means operable while the-door is open a given distance to prevent movement of the switch into on position, in-

dependent means operable to prevent movemovable into on and foff positions, a

safety device associated therewith movable into and out of safety position, said safety device and said switch mechanism having coperative parts arranged rst, to prevent movement of the switch mechanism into the on position when the safety device is in non-safety position, second, to permit movement of the switch mechanism to the on position when the safety device is in. safety position, said safety device comprismg an independent element for preventing movement of the switch mechanism into the n position when the safety device is in nearly safety position, and third, to oppose movement of the safety device to non-safety position in the event of failure of said independent element.

38. A panel box having a pivotally mounted door in one wall thereof, switchv ried by the door having a part disposed in proximity to a moving part of the switch mechanism for moving the latchl mechanism into locked position when the switch mecha-y nism is moved into the on position, all in combination with retaining means carried by and movable with the door having a part substantially concentric vwith the axis of the door hinge, -disposed to be moved into the path of movement of the movable part of the switch mechanism for preventing movement thereof from the olf to the on position when thel door is open, and said retaining means and said movable part of the switch mechanism also having parts disposed to constitute an obstruction to opening movement of the door When the switch is on.

89. A device of the class described, comprising a switch mechanism having a part movable into on nand off positions, a safety device associated therewith movable into and out of safety position, said safety device and said switch mechanism having cooperative parts arranged irst, to prevent movement of the switch mechanism into the on position when the safety device is in non-safety position, second, to permit movement of the switch mechanism to the on position when the safety device is in safety position, third, to prevent movement of the safety device to non-safety position while while the switch mechanism is on, and

auxiliary retaining means for said detachable wall operatively associated i with the switch mechanism to prevent detachment of the detachable wall while the switch mechanism is on.

41. A panel box having a door displaceable to give access thereto, switch mechanism within the box having an operating handle projecting exteriorly of the box and movable into two positions, and means carried by the door operable to move the switch handle into a position constituting a stop for limiting openingimovement of the door.

In testimony whereof I affix my signature in the .presence of two witnesses.

- HUBERT F. KRANTZ.

Witnesses:

JOHN L. KoLLE, J. A. NEWTON. 

